Method of casting aluminium alloys.



WILLIAM ALBERT MQADAMS, OF BAY SHORE, NEW YOR K.-

METHCD 0F CASTING ALUMINIUM ALLOYS.

Specification of Letters Patent.

Patentediluly 9, 1907.

Application filed June 29,1906. Serial No. 324,059.

To (Ill whom it may (or/em:

lie it known that i, 'uaaan ALBERT MtiAnaMs, a eitizen ol the UnitedStates, and a resident hi Bay Shore, in the eounty ol Sull'olk and Stateol' New York, have invented a new and useful Method oi Casting:Aluminium Alloys, ol' \vhieh the following is a specification.

My invention relates to the method of Pasting alu minium alloy, forexample an alloy trompostal ot' aluminium, Zill( and Popper in whieh thealuminium predominates. the ohjeet, being to maintain the strength ofthe east ing and at the same time employ molds made of finely granulatedmaterial eonnnonly spoken of as sand molds. it has heeu found that ahigh degree oi tensile and t-ompression strength in ens-tings oi thisalloy is obtained in great part by rapidly removing the heat from themolten metal alter it is poured and to insure this removal ol' the heatmetal molds have been used with Walls having: a predettn'minedtliiekuess with respect to the easting to remove the he: i the properrapid rate. These metal molds are expensive to make and materially addto the expense of the castings and my present. invention is d ireeted tothe method of room ng the heat at. the proper rate from the molten metaland at the same time using molds made up of linely granulated materialhandled in substantially the same manner as sand molds.

To this end my method t'OllSlSlS broadly in utilizing: the heat ol' themolten mass oi the ousting \vhile hold in lorm by a mold lormed oitiuely gramllated material. to set up around the tasting a solid body ofgood heat- "ondlu'tilul material for rapidly removing the heat from thef'ilFllllfl.

ln praetiee take linely sulalivided 1-:

'bornnduin and erystallized sugar. also linely subdivided, in theproportion of about ten pounds of earborul'ulum to twelve (moves ofsugar and thoroughly mix them-tonether, spraying with wat r sullieient.to reduee the mass to a plasl it state of sullieient stillness to retainits posit ion' when pressed into form around the pattern of the arlit'leto be last.

()n pouring the molten metal into this mohL-the sugar will eement theenrboruudum into a solid body and the earborunduoi thus cemente: into asolid body will rapidly remove the heat from the molten metal \vhieh isto t'orni the casting. it is found furthermore that the lhiekness oi thesolid body formed about the casting will hear the proper relation to thethickness of the casting throughout its several parts so that the heatwill-be removed at the proper rate from the thiel-zer as well as thethinner parts 01' the east ing. v

While the mixture above referred to will serve to remove the heat fromthe casting at the propel rate. 1 prefer to introduce into the mm are aeertain pereem tree of yellow (lay in a lowly subdivided state, forexample, about. ten ounces of the clay to ten pounds of the earhortuidumand twelveminees ol' sugar. This elay prevents tho'sugar and carlmruudumlroni elegging the sieve and gives moldingqualities to the mixture.

1n the event the aluminium .alloy should he ol' such a nature as togenerate moreor 1 gas, 'it would be de sirahle to introduee a pew-outageof finely subdivided arbon in an amountde 'iend'uig upon the amount ofeseapine gases to be taken care oi lor instance, twenty ounces of earhonto ten pounds of earboramhun, twelve (job i ounces of sugar and tenounees of clay.

When the casting has been completed and removed from the mold, the solidbody formed around the cast-' ing may he ground or otherwise mashed intoa. linely subdivided state and again used by the introduetilm ot a smallpereentage of sugar.

What I elaim is:--

l. In the art oi \stlug. forming: a mold of plustie material capable ofbeing eonverted by heat into a solid mass of good heat eonduetine;properties. casting the molten metal therein and utilizing the heat olthe molten metal cast therein to eonvert the said pl: (2 mold into asolid hotly of ,u'ood heal eomlurting properties immediately around thecast metal for nhsorhlng" the heat. from the said east metal. [u the artof rusting. forming, a mold of plastic mate rial capable olf hoina'eonverted lvy heat into a solid mass of good heat conducting properties,(tasting the molten metal in said mold and utilizing the heat of themolten metal to eonvert the, plaslle mold into a solid good heateoudut-ling hotly immediately surrounding the metal and varying inillil'lilloss as the dill'erent parts of the casting to be formed varyin thickness and mass In testimony, that I claim the foregoingas myinvention, 1 have signed my name in presence of two witnesses, this :sthday ol' June, 1901

